Localization of Ambient Sound?

You can use asset localisation to handle this.

Just create an asset of the same type with the same name as your source asset, but in the L10N/{Culture} folder (in your case L10N/zh). eg) If your asset was /Game/Sounds/MyAmbientSound, you’d create your localised asset as /Game/L10N/zh/Sounds/MyAmbientSound.